Lift bridge



Aug. 24, 192e.

J.B. STRAUSS 1.1Ml BRIDGE VFiled Oct. 9, 1923 2 Sheets-Sheet 2 inventor:

Jose '11. 52x/(w55 ying at right angles to the longitudinal main span, rotatable supports at each end thereof to which said main span is pivotally connected, vfixed .supports on which said rotatable supports are rotatably mounted,

`counter weights connected with said rotatable supports to counterbalance the weight of the main span, the rotatable supports being at right angles to the longitudinal axis of the main span and means carried by the main span for rotating the rotatable supports to open and close said main span.

3; A swinging lift bridge comprising a main span, two rotatable supports, one at each end of said main span, stationary `supports on which said rotatable supports are rotatablyv mounted, said rotatable supports connected at one end to the main span substantially on its center line, Counter weights connected with the other ends of said rotatable supports, said rotatable supports being at right angles to the longitudinal axis of the bridge.

4.-. A swinging lift bridge comprising a main span, two rotatable supports, one at each end of said main span, stationary supports on which said rotatable supports are .rotatably mounted, said rotatable supports connected at one end to the main span substantially on its center line, counter weights connected with the other ends of said rotatable supports, the stationary supports and rotatable supports .being in substantially parallel planes, a motor mounted on the main span, shafts connected with said motor and extending to said movable supports, shafts mounted on said movable supports rotatably connected with the shafts on the main span, racks on the stationary supports with which the shafts on the rotatable supports are operatively connected.

5. A swinging lift bridge comprising a main span, two rotatable supports, one at each end of said main span, stationary supports on which said rotatable supports are rotatably mounted, said rotatable supports connected at one end to the main span substantially on its center line, counter weights connected with the other ends of said rotatable supports, the stationary supports and rotatable supports being in substantially parallel planes, a motor mounted on the main span, shafts connected with said motor and extending to said movable supports, shafts mounted on said movable supports rotatably connected with the shatts on the main span, racks on the stationary supports with which the shafts on the rotatable supports are operatively connected, the shafts on the main span extending through the axes of the pivotal connections between the main span and the rotatable supports.

6. A swinging lift bridge comprising a main span, rotatable supports with which said main span is rotatably connected, fixed supports upon which said rotatable supports are rotatably mounted, operating mechanism for moving the rotatable supports to open and Close the main span, and means for preventing oscillation of the main span while it is being moved. I Y

7. A swinging lift bridge comprising a main span, lixed support-s at the opposite ends of said main span, rotatable supports at right angles to the longitudinal axis of the main span and rotatably connected with said xed supports and to which the main span is rotatably Connected, operating mechanism for rotating said rotatable supports to open and close the main span and means mountedy on the main span for relieving the pivotal connections between the main span and the fixed supports from the weight of the main span when it is closed.

Signed at Chicago county. of Cook and State of Illinois, this 20th day of October 1923.

JOSEPH -B. STRAUSS. 

